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LTC2952IF#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30
LTC2952
1
2952fb
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
Pushbutton PowerPath
Controller with Supervisor
The LTC
®
2952 is a power management device that features
three main functions: pushbutton on/off control of system
power, ideal diode PowerPath™ controllers and system
monitoring. The LTC2952’s pushbutton input, which pro-
vides on/off control of system power, has independently
adjustable ON and OFF debounce times. A simple micro-
processor interface involving an interrupt signal allows
for proper system housekeeping prior to power-down.
The ideal diode PowerPath controllers provide automatic
low loss switchover between two DC sources by regulating
two external P-channel MOSFETs to have a small 20mV
forward drop.
High reliability systems may utilize the LTC2952’s monitor-
ing features to ensure system integrity. These features in-
clude: power-fail, voltage monitoring and μP watchdog.
The LTC2952 operates over a wide operating voltage range
to accommodate a large variety of input power supplies. The
part’s combination of low 20mV external MOSFET regula-
tion and very low standby current matches battery powered
and power conscious application requirements.
Pushbutton Controller with Automatic Switchover Between Adapter and Battery
n
Pushbutton On/Off Control
n
Automatic Low Loss Switchover Between DC
Sources
n
Wide Operating Voltage Range: 2.7V to 28V
n
Low 25μA Shutdown Current
n
Guaranteed Threshold Accuracy: ±1.5% of
Monitored Voltage Over Temperature
n
Adjustable Pushbutton On/Off Timers
n
Simple Interface Allows Graceful μP Shutdown
n
Extendable Housekeeping Wait Time Prior to
Shutdown
n
200ms Reset Delay and 1.6s Watchdog Timeout
n
±8kV HBM ESD on PB Input
n
20-pin TSSOP and QFN (4mm × 4mm) Packages
n
Desktop and Notebook Computers
n
Portable Instrumentations
n
Cell Phones, PDA and Handheld Computers
n
Servers and Computer Peripherals
n
Battery Backup Systems
Ideal Diode vs Schottky Diode
Forward Voltage Drop
LTC2952
LT1767-2.5
SHDN
V
OUT
V
IN
PFI
G1
VM
RST
INT
G1STAT
PFO
KILL
WDE
G2
V1
V2
M1
M2
PB
EN
VS
ONT GND OFFT
2952 TA01
ADAPTER, 3V TO 25V
2.5V
12V BATTERY
Si6993DQ
Si6993DQ
μP
365k
511k
100k
*68nF
*OPTIONAL
**SHDN INTERNALLY PULLED UP BY THE LT1767-2.5
*22nF
100k
1k
1k
1k 10k
D2
D3
D1
**
FORWARD VOLTAGE (V)
0.02
CURRENT (A)
0.50
2952 TA01b
0
1
CONSTANT
VOLTAGE
SCHOTTKY
DIODE
IDEAL
DIODE
CONSTANT
R
ON
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
PowerPath and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners.
LTC2952
2
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ABSOLUTE MAXIMUM RATINGS
Supply Voltages
V1, V2, VS .............................................. –0.3V to 30V
Input Voltages
PB .................................... –6V to MAX (V1, V2, VS) V
ONT, OFFT ............................................... –0.3V to 3V
M1, M2, PFI, VM, WDE, KILL ................... –0.3V to 7V
Output Voltages
G1, G2, EN .................... –0.3V to MAX (V1, V2, VS) V
G1STAT, PFO, RST, INT ............................ –0.3V to 7V
(Notes 1, 2)
Input Currents
PB .......................................................–1mA to 100μA
Operating Temperature Range
LTC2952C ................................................ 0°C to 70°C
LTC2952I .............................................–40°C to 85°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec) ...................300°C
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC2952CF#PBF LTC2952CF#TRPBF LTC2952CF 20-Lead Plastic TSSOP 0°C to 70°C
LTC2952IF#PBF LTC2952IF#TRPBF LTC2952IF 20-Lead Plastic TSSOP –40°C to 85°C
LTC2952CUF#PBF LTC2952CUF#TRPBF 2952 20-Lead 4mm × 4mm Plastic QFN 0°C to 70°C
LTC2952IUF#PBF LTC2952IUF#TRPBF 2952 20-Lead 4mm × 4mm Plastic QFN –40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
F PACKAGE
20-LEAD PLASTIC TSSOP
1
2
3
4
5
6
7
8
9
10
TOP VIEW
20
19
18
17
16
15
14
13
12
11
M2
M1
KILL
VM
PFI
WDE
PB
RST
PFO
ONT
G1STAT
G1
V1
VS
V2
G2
EN
INT
GND
OFFT
T
JMAX
= 125°C, θ
JA
= 90°C/W
20 19 18 17 16
6 7 8
TOP VIEW
21
UF PACKAGE
20-LEAD
(
4mm s 4mm
)
PLASTIC QFN
9 10
5
4
3
2
1
11
12
13
14
15
VM
PFI
WDE
PB
RST
V1
VS
V2
G2
EN
KILL
M1
M2
G1STAT
G1
PFO
ONT
OFFT
GND
INT
T
JMAX
= 125°C, θ
JA
= 37°C/W
EXPOSED PAD (PIN 21), PCB GND CONNECTION OPTIONAL
PIN CONFIGURATION
LTC2952
3
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ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V1 = V2 = VS = 2.7V to 28V unless otherwise noted. (Notes 2, 3)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
MAX
Operating Supply Voltage V1, V2 or VS
l
2.7 28 V
I
IN_OFF
Quiescent Supply Current Both Ideal
Diodes Switched Off
(M1 = Open, M2 = 0V)
V1 = 2.7V to 28V, V2 = 0V, VS = Open or
V2 = 2.7V to 28V, V1 = 0V, VS = Open.
Measured Current at V1 or V2.
l
24 60 μA
V1 = 2.7V to 28V, V2 = 3.5V, VS = Open.
Measured Current at V1.
l
515 μA
V1 = 2.7V to 28V, V2 = 3.5V, VS = Open.
Measured Current at V2.
l
23 50 μA
I
IN_ON
Quiescent Supply Current Both Ideal
Diodes Switched On
(M1 = 0V, M2 = 0V)
V1 = VS = 2.7V to 28V, V2 = 0V or
V2 = VS = 2.7V to 28V, V1 = 0V. Measured
Combined Current at V1 and VS or V2 and VS.
l
65 170 μA
V2
PREF_TH
V2 Preferential Threshold Voltage
(M1 = Open, M2 = 0V) (Note 4)
V1 = 28V, VS = Open.
l
3.3 3.8 V
I
LEAK
V1, V2 and VS Inter Pin Leakage to
the Highest Supply
V1 = 28V, V2 = VS = 0V; V1 = VS = 0V,
V2 = 28V; V1 = V2 = 0V, VS = 28V
±3 μA
Ideal Diode Function
V
FR
Ideal Diode PowerPath Forward
Regulation Voltage
(V1 or V2) – VS, 2.7V ≤ (V1 or V2) ≤ 28V
l
10 20 35 mV
V
RTO
Ideal Diode PowerPath Fast Reverse
Turn-Off Threshold Voltage
(V1 or V2) – VS, 2.7V ≤ (V1 or V2) ≤ 28V
∆I
G
≤ –100μA/mV
l
–20 –35 –64 mV
I
G(SRC)
Gate Turn-Off Current G1 = G2 = V
MAX
– 1.5V
l
–2 –5 –10 μA
I
G(SNK)
Gate Turn-On Current V1 = V2 = 2.7V to 28V,
VS = (V1 or V2) – 40mV,
G1 = G2 = V
MAX
–1.5V.
l
2 5 10 μA
I
G(FASTSRC)
Gate Fast Turn-Off Source Current V1 = V2 = 2.7V to 28V,
VS = (V1 or V2) + 0.1V,
G1 = G2 = V
MAX
–1.5V.
l
–0.5 –2.5 –10 mA
I
G(FASTSNK)
Gate Fast Turn-On Sink Current V1 = V2 = 5V to 28V,
VS = (V1 or V2) – 0.1V,
G1 = G2 = V
MAX
– 1.5V.
l
0.3 0.7 2 mA
V
G(ON)
Gate Clamp Voltage I
GX
= 2μA, V
X
= 8V to 28V, VS = V
X
– 0.1V
Measure V
X
– V
GX
l
678 V
V
G(OFF)
Gate Off Voltage I
GX
= –2μA, V
X
= 2.7V to 28V, VS = V
X
+ 0.1V
Measure V
MAX
– V
GX
l
0.2 0.4 V
t
G(ON)
Gate Turn-On Time V
G(OFF)
to V
GS
≤ –3V, C
GATE
= 1nF (Note 5),
V1 = V2 = 12V
0.1 2.5 10 μs
t
G(OFF)
Gate Turn-Off Time V
G(ON)
to V
GS
≥ –1.5V, C
GATE
= 1nF (Note 6),
V1 = V2 = 12V
0.1 2.5 10 μs
Pushbutton Pin (PB)
V
PB(VOC)
PB
Open-Circuit Voltage
I
PB
= –1μA
l
146 V
I
PB
PB
Input Current
V
PB(VOC)
< V
PB
≤ 28V
0V ≤ V
PB
< V
PB(VOC)
l
l
–1 –10
±1
–25
μA
μA
V
TH_PB
PB
Input Threshold Voltage PB
Falling From High to Low
l
0.65 0.77 0.8 V
V
HYS_PB
PB
Input Hysteresis
l
10 25 150 mV
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30

LTC2952IF#TRPBF

Mfr. #:
Buy LTC2952IF#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
Power Management Specialized - PMIC Push Button Power Path Controller with System Monitoring
Lifecycle:
New from this manufacturer.
Delivery:
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